Amazing software dev

In recent past, often I get bogged down with my current work. My Total years of experience is 5.5. I am a software dev, Last 3 years I spent most of my time in building big data pipelines. (Hadoop, Spark, Kafka). Three years back these were buzzwords. It kind of looked cool. Looking back, now I feel that I haven't solved challenging engineering problems. I some times feel that even new grads in FAANG and startups would have solved complicated engineering problems than me. To those amazing software Dev's - what is most interesting and challenging engineering problem you have solved at work ? I wanted to know some inspiring stories of software Dev/ Engineering Manager who made significant contributions to their org. Am I the only one who is not feeling accomplished for what I have done so far ? To those who is in the same boat as me. How do you manage this feeling ? I start leetcode on and off. Have solved close to 150 now. I can prepare well and try get into FAANG. But, Would It help to me overcome this feeling ? what is the guarantee that quality of work I do would be better ? To those who switched to FAANG , Uber, Lyft, Pinterest and to cool startups. Was work better than your previous job ?